LU-4028 quota: improve lfs quota output

LU-4028 quota: improve lfs quota output

- print the total allocated block/inode limit for all OSTs/MDTs
  when the verbose option is specified;
- add 'h' option to print used space in human readable format;

Lustre-commit: 50a11ef2b232f21ebf81a71c71233889d852ae99
Lustre-change: http://review.whamcloud.com/8152

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>
Change-Id: Ied4cf2131524311f8666da7488108cefa8177141
Reviewed-on: http://review.whamcloud.com/10411
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>